The Convention of Druim Cett was supposedly held to settle the relationship between the king of Dál Riata, the Irish colony in what is now western Scotland, and the Irish kings of northern Ireland.

Dál Riata was the small colony based in County Antrtim from which the Gaelic conquest and colonisation of much of Scotland began.

The status of the Irish colony was reputedly confirmed, and rights to tax and levy agreed between the rulers.

King Fergus from which the town of Carrickfergus in County Antrim takes its name, was one of the Dál Riata kings.